Structural, superconducting and vortex pinning properties of Nb-substituted Bi-2212 ceramic superconductor


Nane F. K. , Ozcelik B.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, cilt.30, ss.12783-12789, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 30
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1007/s10854-019-01643-z
  • Dergi Adı: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
  • Sayfa Sayıları: ss.12783-12789

Özet

In this research, we have deeply focused to investigate the effects of Niobium (Nb) substitution for the Ca site in the Bi2Sr2Ca1-xNbxCu2O8+y superconductors with x=0.00, 0.05, 0.10, 0.20, 0.30, and 0.40. The materials were synthesized via well-known solid state reaction method. We have performed X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and dc magnetization measurements in order to understand the effects of Nb-content. XRD results exhibit that the Bi-2212 phase is a major phase for pure sample. On the other hand, the volume fraction of Bi-2212 declines with increasing Nb substitution and relocates with low-Tc phase, namely Bi-2201. The maximum pinning force, F-Pmax, values of x=0.05 and 0.10 Nb-substituted samples are improved in comparison to the pure sample. These values are found as 5.18x10(7) and 5.21x10(7)OeA/cm(2) at T=10K for x=0.05 and 0.10 Nb-substituted sample, respectively, which are higher than the 4.92x10(7)OeA/cm(2) value of the pure sample.